Bicycle-lock.



. No. 659,439. Patented Oct. 9, I900.

F. J. ERRICK &. F. X. BATT.

BICYCLE LucK.

(No Model.)

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UNITED STATES PATE T FFICE.

FRANK J. ERRIOK, OF NORTH TONAWANDA, AND FRANK X. BATT, OF TONAWANDA,NEW YORK.

BICYCLE- LOCK.

SPECIFICATION forming part of Letters Patent No. 659,439, dated October9, 1900.

Application filed April 2, 1900. Serial No. 11,197. (No model.)

To all whom it may concern.-

Be it known that we, FRANK J. ERRIOK, residing at North Tonawanda,Niagara county, and FRANK X. BATT, 'residing at Tona'wanda, Erie county,New York, citizens of the United States, have. invented new and ,usefulImprovements in Bicycle-Locks,of which the following is a specification.

This invention relates to that class of velocipede -locks which arepermanently attached to the frame of the bicycle or other velocipede,and more particularly to a lock of this kind which is adapted to engagewith the rear sprocket-wheel of a bicycle.

The objects of our invention are to provide a reliable and inexpensivelock which can be readily operated and to so construct the lock that thelocking-bolt can be projected more or less to compensate for theadjustment of the sprocket-wheel.

In the accompanying drawings, Figure 1 is a side elevation of ourimproved lock and the adjacent rear portion of the bicycle-frame towhich the same is secured. Fig. 2 is a detached side elevation of thelock and'a portion of the rear sprocket-wheel, the front' plate of thelock-case being removed to expose the interior of the lock and the headof the locking-bolt being shown in section. Fig. 3 is a transversesection in line 3 3, Fig. 1. Fig. 4 is a longitudinal section in line 44:, Fig. 1, showing the bolt in engagement with the sprocket-wheel. Fig.5 is a detached perspective view of the locking-bolt.

Like letters of reference refer to like parts in the several figures.

A is one of the arms of the lower rear fork of a bicycle, A the adjacentstay member,

and A the slotted lug or fitting connecting said members.

B is the rear axle, adjustably secured in the,

embracing said fork-arm and an arm F, which extends upwardly andrearwardly from the case and is fastened at its upper end to the staymember A by a clip F. By this attachment the lock is firmly secured tothe frame and held against lenthwise displacement on the fork by the armF.

G is a locking-bolt which slides lengthwise in the lock-case and whichextends rearwardly through an opening formed in the rear end thereof.The bolt is provided at its front end with a curved or segmentallocking-head g, which is adapted to interlock with the opposing frontportion of the sprocket-wheel C. This head is provided with parallelside flanges g, which extend forwardly from the head and which areadapted to bear against opposite'sides of the sprocket-wheel. Theseflanges form, with the curved portion g, a channeled or trough -shapedlockinghead which embraces both the sides and the edge of thesprocket-wheel, thereby reliably interlocking the bolt with thesprocket-wheel when the'bolt is in its projected position and preventingunauthorized persons from displacing the bolt laterally out ofengagement with the.

sprocket. The bottom of the channeled locking-head is curvedconcentrically with the edge of the sprocket-wheel, so as to fit closelyagainst the same, and is provided with a central socket or recess gwhich receives one of the teeth of the sprocket-Wheel. The lookingheadis preferably made of sufficient length to bridge the space between thetwo teeth of the sprocket-wheel on opposite sides of. the tooth whichenters the socket of the head, as shown. By providing the lookingheadwith this socket the sprocket-Wheel is locked with additional security.

The lock is arranged at such a distance from the sprocket-wheel that inthe retracted position of the locking-bolt, in which itshead bearsagainst the rear end of the case, the

'bolt fully clears the teeth of the sprocket- Wheel, as shown in Fig. 1.The bolt is guided by a transverse pin h, which proj ectsinwardly in itsprojected position; but we prefer to- ICC employ the devices shown inthe drawings for this purpose. These consist of two or more elbow-shapedpawls or tumblers i,which swing on a horizontal pivot-pin t, secured tothe lock-case. The horizontal arms of these tumblers are provided withratchet-teeth 6 which are adapted to interlock with a similar tooth j,formed at the inner end of the locking-bolt. The tumblers are held inengagement with the toothed bolt by suitable springs k. The rear edgesof the tumblerteeth are inclined, and the front edge of the bolt-tooth jis correspondingly beveled, so that the bolt can be withdrawn withoutrestraint until its head 9 bears against the edge of the sprocket wheel,while the opposite edges of said teeth are abrupt, so that the bolt isautomatically locked against inward movement in all positions thereof.The teeth of the several tumblers are arranged in stepped order or sothat the teeth of each tumbler are slightly in advance of those of thenext tumbler. By this arrangement the teeth can be made sufficientlylarge or coarse to afford the desired strength, and yet permit of acomparatively-fine adjustment or variation in the extent of withdrawalof the bolt. This is necessary to enable the locking-bolt to follow theadjustment of the sprocketwheel incident to taking up wear or loosenessof the driving-chain.

The locking-bolt is conveniently projected by a knob or pin Z, securedto its outer side and projecting through a slot l, formed in the outerwall of the lock-case. The bolt is released for unlocking thesprocket-wheel by a suitable key, which is passed through a slot m,formed in the front side of the case, and which engages against the rearedge of the depending arms i of the tumblers i, as shown by dotted linesin Fig. 2, thereby swinging the toothed arms of the tumblers upwardlyout of engagement with the locking-bolt.

n is-a spring which automatically withdraws the locking-bolt from thesprocket-wheel when released. This spring is arranged in the slot 7b ofthe bolt between the inner end of the slot and the guide-pin h and iscompressed when the bolt is projected.

The rear edges of the releasing-arms of the tumblers t are arranged instepped order or so as to extend beyond one another, as shown in Fig. 2,and the key of the lock, which is not shown in the drawings, isconstructed accordingly in a well-known manner, so as to operate all ofthe tumblers simultaneously.

The lug 0 of the lock-case, located above the tumblers, forms a stopwhich limits the upward movement of the toothed arms of the tumblers.This stop is arranged to permit just sufiicient clearance between thetooth of the locking-bolt and the teeth of the tumblers to release thebolt, and the rear edges of the releasing-arms of the tumblers areofiset a distance corresponding to the stroke of the tumblers. If it beattempted to throw the tumblers with an ordinary fiat bar, only thattumbler whose releasing-arm extends rearmost will be raised, and as soonas said tumbler strikes the stop 0 its releasing-arm in turn acts as astop, which prevents the bar from swinging the remaining tumblers ontheir pivots, thus rendering it impossible to throw all of the tumblersexcept with the proper key.

We claim as our invention 1. In a velocipede-lock, the combination witha case adapted to be rigidly secured to a velocipede-frame, of alocking-bolt guided in said case and havinga concave head which isadapted to bear against the edge ofa sprocketwheel, and which isprovided with forwardlyeXte-nding vertical flanges which are adapted toembrace the sides of the sprocket-wheel, and means for retaining saidbolt in its projected position, substantially as set forth.

2. In a velocipede-lock, the combination with a case adapted to berigidlysecured to a velocipede-frame, of a sliding locking-bolt guidedin the case and having acurved head which is constructed to bear againstthe edge of a sprocket-wheel and which is provided with a socket adaptedto receive a tooth of the sprocket-wheel, and on opposite sides of saidsocket with forwardly-extending flanges adapted to embrace the sides ofthe sprocketwheel, and means for retaining the lockingbolt in itsprojected position, substantially as set forth.

3. In a velocipede-lock, the combination with a case, having anattachment for securing the same to a velocipede-frame, of a slidingbolt guided in the case and provided with a locking-tooth, elbow-shapedtumblers pivoted side by side within the casing and having theirhorizontal arms provided with teeth which interlock with the tooth ofthe bolt, and a stop arranged to limit the releasing movement of saidtumblers, the depending arms of the tumblers being offset rearwardly onebeyond another a distance corresponding to the throw of the tumblers,substantially as set forth.

4. In a velocipede-lock, the combination with a case having anattachment for securing the same to a velocipede-frame, of a slidingbolt guided in the case and provided with a locking-tooth, a pluralityof tumblers pivoted side by side in the casing and having toothed armswhich interlock with the tooth of the sliding bolt and actuating-armswhich are offset one beyond another, and a stop arranged to limit thereleasing movement of said tumblers, substantially as set forth.

5. In a velocipede-lock, the combination with a case having anattachment for securing the same to a velocipede-frame, of a slidingbolt guided in the case and provided with a locking-tooth, a pluralityof tumblers piv- -oted side by side in the case and having theirhorizontal arms provided with ratchetteeth which interlock with thetooth of the bolt, the teeth of the several tumblers being arranged instepped order, and springs for holding said tumblers in engagement withthe toothed locking-bolt, substantially as set forth. Y

6. In a velocipede-lock, the combination with a case having anattachment for securing the same to a veloeipede-frame, of a slidingbolt guided in the case and provided with a locking-tooth, and ashiftingpin which passes through a slot of the case, of elbow-.

shaped tumblers pivoted side by side within the casing and having theirhorizontal arms provided with ratchet-teeth which interlock with thetooth of the bolt, the teeth of the several tumblers being arranged instepped order and the depending arms of the elbowshaped tumblers beingarranged in similar order, and springs which hold said tumblers inengagement with the toothed locking-bolt, substantially as set forth.

Witness our hands this 23d 1900.

day of March,

FRANK J, ERRIOK; FRANK X. BATT.

Witnesses:

CARL F. GEYER, CLAUDIA M. BENTLEY.

